By simplifying \((\sqrt{7}+\sqrt{5}) * (\sqrt{7}-\sqrt{5})\), we get __________(a) 24(b) 2(c) 12(d) 74This question was addressed to me by my school teacher while I was bunking the class.My doubt stems from Representing Real Numbers on the Number Line & Real Numbers Operations in section Number Systems of Mathematics – Class 9

By simplifying \((\sqrt{7}+\sqrt{5}) * (\sqrt{7}-\sqrt{5})\), we get _

1.	By simplifying \((\sqrt{7}+\sqrt{5}) * (\sqrt{7}-\sqrt{5})\), we get __________(a) 24(b) 2(c) 12(d) 74This question was addressed to me by my school teacher while I was bunking the class.My doubt stems from Representing Real Numbers on the Number Line & Real Numbers Operations in section Number Systems of Mathematics – Class 9
Answer» Correct choice is (b) 2 The explanation is: We know that \((\SQRT{a}+\sqrt{b}) * (\sqrt{a}-\sqrt{b})\) = a-b By applying that RULE here, we GET = \((\sqrt{7}+\sqrt{5}) * (\sqrt{7}-\sqrt{5})\) = 7-5 = 2.

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